Ingham



'D. D. GHAM AND R. U. SAWYER 0mm FABRIC.

A ATION FILED FEB. 18. 1918.

1,316,783. PatentedSept. 23, 1919.

Homogeneous coating of (@2214 laid and Castor oil, embedded zn the faric.

it il an ATN are.

DANIEL D. FROTHINGHAM, OF SALEM, RALPH U. SAWYER, 0F WINCHESTER,

MASSACHUSETTS, ASSIGNORS TO SAWYER PRODUCTS COMPANY, OF WATER-' TOWN, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

COATED FABRIC.

Specification of Letters Patent.

Patented Sept. 23, 19919.

Application filed February 18, 1918. Serial No. 217,968.

To all whom it may concern:

Be it known that we, DANIEL D. FROTH- INGHAM and RALPH U. SAWYER, citizens of the United States, residing at Salem and Winchester, respectively,in the counties of Essex and Winchester, respectively, and State of Massachusetts, have invented certain new and useful Improvements in Coated Fabrics; and we do hereby declare the followin to be a full, clear, and exact descriptlon of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to coated fabrics. The object of the invention is to reduce the cost and improve the qualities of coated fabrics. To these ends the invention consists in the coated fabric hereinafter described and particularly defined in the claims.

The accompanying drawing illustrates diagrammatically a cross-section of the coated fabric.

The material to be coated is illustrated as a cloth or canvas 1 having a coating 2 applied to it. The preferred coating consists Wood alcohol 90 oz. Acetone 36 Amylacetate 12 Scrap celluloid 54-60 Castor oil 72 Soluble or spirit negrocin This coating mate-rial is prepared by mixing the solvents, viz., the wood alcohol, acetone, amylacetate, and the soluble or spirit negrocin, in a mixer, and then the comminuted scra cellulOid,'Such as cleaned moving-picture Elms, or other celluloid compounds, is introduced into the mixture and the mixing process is continued until the batch is thoroughly mixed, after which the castor oil is stirred or mixed in. The resulting coating material is a stiff viscous mass which is applied to the fabric to be coated by a single coating operation, preferably by spreading the material on the surface of the fabric to be coated and pressing 1t against such material with longcontinued heavy pressure so as thereby inwardly to unite and secure the coating to the fabric. After the coating has been applied the solvents are evaporated and the firm flexible coating remains securely attached to the fabric. Thus the wood alcohol, acetone and amylacetate are entirely removed and the coating consists essentially of a single integral homogeneous layer of acompound of celluloid and castor oil. This coating is free from pin-holes and is highly flexible and durable. By increasing the amountof castor oil the flexibility of the coating may be increased. By increasing the amount of the amylacetate and decreasing the amount of acetone, a coating having a high gloss will be produced. Other solvents may be employed if desired, and if it would not be objectionable for the coating to display a bloom, the amylacetate may be entirely omitted. The coating of the formula is highly flexible at all temperatures from zero to 100 F.

Heretofore fabrics having a coating of celluloid or nitrocellulose have been applied in a large number of layers so that the resulting product was a fabric having a laminated coating. Moreover, the several layers of the former coatings were of diflerent composition. One of the principal virtues of the coated fabric of the present invention resides in the homogeneity of the coating which from top to bottom is of uniform composition. Another substantial virtue of the coating fabric of the present invention resides in the fact that it isentirely devoid of pin-holes, a detriment at present in all coated fabrics of which the writer is aware.

The coated fabric of the present invention is exceptionally durable. By reason of its durability, its freedom from pin-holes, the homogeneity of the coating, it is superior in quality to any known coated material, and besides is susceptible of being produced at a cost very much lower than the cost of laminated coated fabrics. The cost of the completed fabric, including the base of canvas and the 20 oz. per square yard of coating of the nitrocellulose castor oil compound being approximately onehalf the cost of'multiple coated fabrics.

The method and machine disclosed herein form the subject matter of copending applications filed by us on even date herewith and bearing Serial Nos. 217,967 and 217,969, respectively.

Having thus described the invention What is claimed is:

1. A coated fabric consisting of a fabric provided With a single homogeneous integral layer coating of substantial thickness consisting essentially of celluloid and castor oil containing soluble coloring matter.

2. A coated fabric consisting of a fabric having embedded therein a single homogeneous integral layer coating of substantial thickness consisting essentially of celluloid and caster-oil.

3. An intermediate product consisting of a fabric havingembedded therein a single homogeneous layer of coating material of the nature described of substantial thickness and of a stifl yet viscous nature at ordinary room temperature, all portions of said layer being secured together by the cohesion of the particles thereof.

DANIEL D. FROTHINGHAM.

RALPH U. SAWYER. 

